cards like replenish mtg regular from Urza's Destiny (UDS) Proxy Actually Good Budget Alternatives to

A great starting framework is the "8x8 Theory." The idea is to break down your deck's needs into eight essential categories and dedicate roughly eight cards to each

Shifting Ceratops You don't see this MTG dinosaur card making the rounds much anymore, but Shifting Ceratops is an excellent, efficiently-costed creature with an ability that acts like a utility belt and can handle any situation

Each color in Magics color pie has several things its best at

Mox Sapphire + Mox Emerald + Mox Jet For the same reasons as the original dual lands, Mox Sapphire, Mox Emerald and Mox Jet wind up as the most expensive of the Moxes

Harald Unites the Elves, and Haunting Voyage can all get your elves back while Evolution Witness grabs everything else

If you want to be a little more cut-throat, that's certainly a good place to start